ABSTRACT
The paper presents an approach of how safety of autonomous driving can be analysed by using semi-Markov processes. The approach can be used in development and assessment of vehicles implementing autonomous driving. Through a case study, it is indicated that a semi-Markov process model can capture relevant properties related to safety of autonomous driving. The case study particularly investigates if Level 3 autonomy, in which the driver is reponsible to take over when alerted by the system, can be made sufficiently safe. The paper also highlights how the current standard ISO26262 is insufficifient for autonomous driving where the system itself affects the exposure of operational situations. Therefore, as complement to ISO26262, it is shown how the proposed approach can be used to derive top level safety requirements.
